用C语言写一个在lcd上触摸滚动条，lcd文本显示翻页的例程，lcd是正点原子的

非常感谢您的提问！以下是一个简单的用C语言编写的在lcd上触摸滚动条和文本显示翻页的例程，适用于正点原子的lcd：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lcd.h"
#include "touch.h"

#define MAX_LINES 10
#define LINE_LENGTH 20

int main()
{
    int i, j, k, x, y, start_line, end_line, num_lines;
    char text[MAX_LINES][LINE_LENGTH];
    int line_height = lcd_get_font_size() + 2;
    int touch_x, touch_y;
    int touch_down = 0;
    int touch_start_y, touch_start_line;

    lcd_init();
    touch_init();

    // 初始化文本
    for (i = 0; i < MAX_LINES; i++) {
        sprintf(text[i], "Line %d", i + 1);
    }

    // 计算文本行数
    num_lines = MAX_LINES;
    for (i = MAX_LINES - 1; i >= 0; i--) {
        if (strlen(text[i]) == 0) {
            num_lines--;
        } else {
            break;
        }
    }

    // 显示文本
    start_line = 0;
    end_line = lcd_get_height() / line_height - 1;
    for (i = start_line; i <= end_line && i < num_lines; i++) {
        lcd_draw_string(0, (i - start_line) * line_height, text[i]);
    }

    // 显示滚动条
    lcd_draw_rect(lcd_get_width() - 10, 0, 10, lcd_get_height(), COLOR_BLACK);
    lcd_fill_rect(lcd_get_width() - 10, 0, 10, lcd_get_height() * (end_line - start_line + 1) / num_lines, COLOR_BLUE);

    while (1) {
        // 处理触摸事件
        if (touch_get_status() == TOUCH_PRESSED) {
            touch_down = 1;
            touch_start_y = touch_get_y();
            touch_start_line = start_line;
        } else if (touch_get_status() == TOUCH_RELEASED) {
            touch_down = 0;
        } else if (touch_down) {
            touch_x = touch_get_x();
            touch_y = touch_get_y();
            if (touch_y < touch_start_y) {
                start_line = touch_start_line - (touch_start_y - touch_y) / line_height;
            } else if (touch_y > touch_start_y) {
                start_line = touch_start_line + (touch_y - touch_start_y) / line_height;
            }
            if (start_line < 0) {
                start_line = 0;
            } else if (start_line > num_lines - (end_line - start_line + 1)) {
                start_line = num_lines - (end_line - start_line + 1);
            }
            // 更新文本和滚动条
            lcd_clear(COLOR_WHITE);
            for (i = start_line; i <= end_line && i < num_lines; i++) {
                lcd_draw_string(0, (i - start_line) * line_height, text[i]);
            }
            lcd_draw_rect(lcd_get_width() - 10, 0, 10, lcd_get_height(), COLOR_BLACK);
            lcd_fill_rect(lcd_get_width() - 10, 0, 10, lcd_get_height() * (end_line - start_line + 1) / num_lines, COLOR_BLUE);
        }

        // 处理翻页事件
        if (lcd_is_pressed(KEY_UP)) {
            start_line--;
            if (start_line < 0) {
                start_line = 0;
            }
            // 更新文本和滚动条
            lcd_clear(COLOR_WHITE);
            for (i = start_line; i <= end_line && i < num_lines; i++) {
                lcd_draw_string(0, (i - start_line) * line_height, text[i]);
            }
            lcd_draw_rect(lcd_get_width() - 10, 0, 10, lcd_get_height(), COLOR_BLACK);
            lcd_fill_rect(lcd_get_width() - 10, 0, 10, lcd_get_height() * (end_line - start_line + 1) / num_lines, COLOR_BLUE);
        } else if (lcd_is_pressed(KEY_DOWN)) {
            start_line++;
            if (start_line > num_lines - (end_line - start_line + 1)) {
                start_line = num_lines - (end_line - start_line + 1);
            }
            // 更新文本和滚动条
            lcd_clear(COLOR_WHITE);
            for (i = start_line; i <= end_line && i < num_lines; i++) {
                lcd_draw_string(0, (i - start_line) * line_height, text[i]);
            }
            lcd_draw_rect(lcd_get_width() - 10, 0, 10, lcd_get_height(), COLOR_BLACK);
            lcd_fill_rect(lcd_get_width() - 10, 0, 10, lcd_get_height() * (end_line - start_line + 1) / num_lines, COLOR_BLUE);
        }
    }

    return 0;
}

希望这个例程能够帮助您实现在lcd上触摸滚动条和文本显示翻页的功能。如果您有任何问题，请随时联系我。